A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

John was piloting a plane behind a car but was never able to overtake it. Why?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?